How to update this specific data in this user collection in mongodb? - performance

Question

I need to do an update to a specific soldier in this user collection:
For example:
user: {
myArmy : {
money : 100,
fans : 100,
mySoldiers : [{
_id : ddd111bbb,
mySkill : 50,
myStamina : 50,
myMoral : 50,
},
{
_id : ddd111dd ,
mySkill : 50,
myStamina : 50,
myMoral : 50,
}],
}
}
I want in my update query to do like the following:
conditions = { _id : user._id };
update =
{ 'myArmy.mySoldiers._id' : soldierId},
{
'$set': {
'myArmy.money' : balanceToSet,
'myArmy.fans' : fansToSet,
'myArmy.mySoldiers.$.skill': skillToSet,
'myArmy.mySoldiers.$.stamina': staminaToSet,
'myArmy.mySoldiers.$.moral': moralToSet
}
}
and this is the final query:
User.update(conditions, update, options, function(err){
if (err) deferred.reject;
stream.resume();
});
And the end result if soldierId is 'ddd111bbb':
user: {
myArmy : {
money : 200,
fans : 100,
mySoldiers : [{
_id : ddd111bbb,
mySkill : 150,
myStamina : 250,
myMoral : 50,
},
{
_id : ddd111dd ,
mySkill : 50,
myStamina : 50,
myMoral : 50,
}],
}
}
Those skill, moral and stamina should change only on the specific soldier.
How do i get the $ to be the index number of this soldier, what is missing from the update query above?

Answer 1

This is what i was looking for:
conditions = { _id : user._id , 'myArmy.mySoldiers._id' : soldierId};
update = {
$set: {
'myArmy.balance': balanceToSet,
'myArmy.fans' : fansToSet,
'myArmy.tokens' : tokensToSet,
'myArmy.mySoldiers.$.skill' : skillToSet,
'myArmy.mySoldiers.$.stamina': staminaToSet,
'myArmy.mySoldiers.$.moral' : moralToSet
}
}
This gave me the result i wanted, before i accidentally inserted the condition query with the update one...